<template>
<div class="tags" v-if="showTags">
    <ul>
        <li class="tags-li" v-for="(item,index) in tagsList" :class="{'active': isActive(item.path)}" :key="index">
            <router-link :to="item.path" class="tags-li-title">{{item.title}}</router-link>
            <span v-if="item.close" class="tags-li-icon" @click="closeTags(index)"><i class="el-icon-close"></i></span>
        </li>
    </ul>
    <div class="tags-close-box">
        <el-dropdown @command="handleTags">
            <el-button size="mini" type="primary">
                标签选项<i class="el-icon-arrow-down el-icon--right"></i>
            </el-button>
            <el-dropdown-menu size="small" slot="dropdown">
                <el-dropdown-item command="other">关闭其他</el-dropdown-item>
                <el-dropdown-item command="all">关闭所有</el-dropdown-item>
            </el-dropdown-menu>
        </el-dropdown>
    </div>
</div>
</template>

<script>
import bus from './bus';
export default {
    data() {
        return {
            tagsList: []
        }
    },
    methods: {
        isActive(path) {
            return path === this.$route.fullPath;
        },
        // 关闭单个标签
        closeTags(index) {
            const delItem = this.tagsList.splice(index, 1)[0];
            const item = this.tagsList[index] ? this.tagsList[index] : this.tagsList[index - 1];
            if (item) {
                delItem.path === this.$route.fullPath && this.$router.push(item.path);
            }else{
                this.$router.push('/');
            }
        },
        // 关闭全部标签
        closeAll(){
            const curItem = this.tagsList.filter(item => {
                return item.close == 0;
            });
            this.tagsList = curItem;
            this.$router.push('/');
        },
        // 关闭其他标签
        closeOther(){
            const curItem = this.tagsList.filter(item => {
                return item.close == 0 || item.path === this.$route.fullPath;
            });
            this.tagsList = curItem;
        },
        // 设置标签
        setTags(route){
            const isExist = this.tagsList.some(item => {
                return item.path === route.fullPath;
            })
            !isExist && this.tagsList.push({
                close: (route.meta && route.meta.noclose == 1)? 0:1,
                title: route.meta.title,
                path: route.fullPath,
                name: route.matched[1].components.default.name
            })
            bus.$emit('tags', this.tagsList);
        },
        handleTags(command){
            command === 'other' ? this.closeOther() : this.closeAll();
        }
    },
    computed: {
        showTags() {
            return this.tagsList.length > 0;
        }
    },
    watch:{
        $route(newValue, oldValue){
            this.setTags(newValue);
        }
    },
    created(){
        this.setTags(this.$route);
    }
}
</script>
<style>
    .tags {
        position: relative;
        height: 30px;
        overflow: hidden;
        background: #fff;
        padding-right: 120px;
    }

    .tags ul {
        box-sizing: border-box;
        width: 100%;
        height: 100%;
    }

    .tags-li {
        float: left;
        margin: 3px 5px 2px 3px;
        border-radius: 3px;
        font-size: 12px;
        overflow: hidden;
        cursor: pointer;
        height: 23px;
        line-height: 23px;
        border: 1px solid #e9eaec;
        background: #fff;
        padding: 0 5px 0 12px;
        vertical-align: middle;
        color: #666;
        -webkit-transition: all .3s ease-in;
        -moz-transition: all .3s ease-in;
        transition: all .3s ease-in;
    }

    .tags-li:not(.active):hover {
        background: #f8f8f8;
    }

    .tags-li.active {
        color: #fff;
    }

    .tags-li-title {
        float: left;
        max-width: 80px;
        overflow: hidden;
        white-space: nowrap;
        text-overflow: ellipsis;
        margin-right: 5px;
        color: #666;
    }

    .tags-li.active .tags-li-title {
        color: #fff;
    }

    .tags-close-box {
        position: absolute;
        right: 0;
        top: 0;
        box-sizing: border-box;
        padding-top: 1px;
        text-align: center;
        width: 110px;
        height: 30px;
        background: #fff;
        box-shadow: -3px 0 15px 3px rgba(0, 0, 0, .1);
        z-index: 10;
    }

</style>
